It is most definetly A. the others wouldn't make any sense.
I believe it could be either B or D.
You put the numbers you want to compare in a line with a space in the middle. the put
if the left is bigger and
if the right side is bigger.
It is that the angle has to be formed by two pairs of congruent/corresponding sides of the triangle
Use the power, product, and chain rules:
• product rule
• power rule for the first term, and power/chain rules for the second term:
• power rule
Now simplify.
You could also use logarithmic differentiation, which involves taking logarithms of both sides and differentiating with the chain rule.
On the right side, the logarithm of a product can be expanded as a sum of logarithms. Then use other properties of logarithms to simplify
Differentiate both sides and you end up with the same derivative: